Oval compass.



J. H. C. BEISSWENGER.

OVAL COMPASS APPLICATION FILED MAR. 9. 19:8.

Patented D00. 3, 1918.-

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. mmtssss INVENTOR x/HC, fial'sawenyer' ATTORNEY .l. H. C. BEESSWENGER.

OVAL COMPASS.

APPLICATION FILED MAR. 9. 1918 Parented Dec. 3, 1918.

2 SHEETS-SHEET 2 INVENTOR JCB/kfifieng WITNESSES A WORD/E VS act description.

plane of the instrument;

QovAL COMPASS. i

reactor;

n ucatien filed March 9. 191a Serial No. 221,477.

To all whom it may concern Be it known that 1, JOHN HHOHARLEQ BEISSWENGER, a, citizen of theUnited States, and a resident of Newark, in the county of Essex andState of NeWJersey, have invented anew and Improved Oval Gompass, of which the following is a full, clear, and exyAmong the principal objects which the presentinvention has in view are: to provide means for mechanicallycontrolling the path of a marking member for producing an oval outline; to adjust the compass, readily; to provide means for varying the range of the marking member; and to simplify the construction of the compass. a, Drawings;

Figurelis a side view of a compass construoted andarranged in accordance with the present invention; A it j 1 Fig. 2 is a longitudinal section or the same, the section being taken on the median Fig. 3 isa schematic view showingin plan, three positions of the compass and, a portion of an oval outlined thereby FigLAE 's a side view of an extension bar I for the operating beam of the compass;

Fig. 5 is a side view, of an extension link for the adjusting beam of the compass; a

Figs;,6 and? are extension bars for the scale bar of the compass.

t t 1 Description; t As seen in the drawings, apivot post is provided, which has two prick points 12 carried in a :chuck 13. The chuck 13 has sockets bored lengthwise thereof anda perforation bored transverse thereof,vthe center of said perforation being alined withathe centers of said sockets. Movably mounted in, the perforationis a screw-threaded perforatedpin 14, the perforations in saidpin being adapted to have extended therethrough, said prick points. a j

Engaging the threaded extension of the pin 14, is a? nut 15; whichwhen manipulated crowds upon the chuck 13 and draws the pin 14 so that said pin impingeswon!thepin it points to clamp the same-rigidly in adjust ed position. The chuck 13 is preferably in tegrally formed with a handle bar 16. The

bar 16 has a covering hand grip 17 whichis held between the chuck 13 and theend of an offset 18 with which the said bar is en Specification of Letters Patent.

1 is associated in service 1 Patented Dec. a, rare.

gaged, by means of a tapped socket formed in saidofi'set. The 0ffset118 isstructurally united by means of a: stud shaft 19 and clamping nut 20, with. ahbracket arm 21. The bracket arm, 21 is perforated adjacent the end thereof to hold the stud shaft 22 it formedfat the inner end of the adjusting The stud shafts 19 and serve as mountingsfor the meshed gearwheels24 and 25,;respectively. The gear wheel 2 1 is t,

rigidly attached to the hub of a manipulatmg rod 26, while the gearwheel 25 is rigidly attached to the stud shaft 22 and arm n The wheel 25 is held in structural rela- 111011 tofthe arm 23 by means of screw nut.

1 j j The arm engaged by a loop head27 intheendof'a screw28; The screw 28 is engaged by a mt 29, which maybe man pulated to force thecdges of a cup washer 3O on the top of the arm, 23 r ex tension rods 31 with which the said arm 23 Rotatively connected with the cup washer ,30landinutr29, isa link bar 32. The link a bar 32 extends through theperforation in a pivot block 33, which block is pivotally mounted in the top of ahandle 34: of thepen of a marking member, 35. The member 35 hasa transverse borethrough which the manipulatingbar 36 freelyl moves. It is obvious that the pen shown in the drawings may be replaced by any desired marking tooltor member. at

Whenthe device is constructed as shown in thedrawingsfand above described, the operation is as follows: j a i i The marking member 35 and handle 34 connected, therewith, is adjusted on the link 32,iafter the said link 32,arm 23, and rod 26 have been disposed in superposed ar rangei'nent and in the sameplane. The variation between the short and the long axes 1 of the .instrumentsisi arrivedat and provided for by loosening the nuts 29 and 36 to per- Imit sliding of the loop head 27 and pivot block 33 ontheiarm and link bar 32,,re

spectively. The loop head27 is then moved the required distance on the arm 2301? rod 31;from the center of the handle bar, which coincides with the center of the oval to be made the adjustment, the nuts 29 and 36 are a completed. The adjustment of the loop tightened to hold the loop 27 and head 33 immovable onthe arm 23 and rod 32, respectively. It will be observed that the spread pin points 12 prevent the rotating of thehandle bar 16, ofiset l8, bracket arm 21 and parts connected therewith. These members remain throughout the operation relatively fixed. The operator then graspsthe manipulating rod 26 and places the end of the marking instrument on the paper. The handle 26 is moved around the points 12, rotating the wheel 24 on the stud shaft 19. The wheel 24 being meshed with the wheel 25-, rotates the latter, together with the arm 23 connected therewith, but in the rotary direction the reverse of that followedby' the wheel 24. As shown in Fig. 3,the gyrations of the manipulating rod 26 and thearm 23 are in relatively opposite directions so that the two approach, the rod 26 passing under the wheel= 25 and arm 23.

The arm 23 and extension rod 31 connected therewith reverse their positions relation to the link 32; the end for endpositions. The loop head 27 passes through a position wherein said loop head is intermediate the handle 34 and handle-bar 16. It is obviousthat as the loop head assumes the last-mentioned position,

the removal of the marking member 35 from theprick points 12, is'fart'her extended, while when the loop-head 27 is in theposition shown in Fig. 1 Where the handle bar 16 is'intermediate the loop head and marking member, the said marking memberis nearest the prick points. These two positions correspond with the long and short radii of the oval.

In Figs. 4 to 7, inclusive, a number'o-f extension bars has been shown. The bar 37 is connected with the manipulating rod 26, the milled-head screw 38 being removed from the tapped perforation in theend of the rod 26 to receive the threaded extension 39 of the bar 37. At the end of thebar 37, a corresponding tapped holeis formed to receive the shank ofthemilled-head screw 38.

In Fig. 5, the bar'40 corresponds in cross section with the link 32 and is provided with fins 41, whichfit recesses 42 in the end of the link 32.- At" the bottom of the recesses 42, a tappedhole is provided to receive the threaded end 43 of' an elongated'screwwh-ich extends; throughthe full length of the bar40 and hasa milledhead 44.

In Figs. 6 and 7, extension bars 45 and 46 are shown. These are calibrated to corre- That is to say, reverse spond with the arm and bar 31. The bars 45 and 46 are held in operative position by 0 Zaz'ms.

1. A compass as characterized comprising non-rotative center post; a wheel rotati'vely mounted upon said post and concentric therewith; a marking member; an articulated coimection between said member and said wheel for moving said member toward and away from said wheel in correspondence with the rotation of said wheel; and means connected with said member for manually moving the same, said means operating to rotate said wheel.

2. A compass as characterized comprising a pivot post; means for non-rotatively mounting said post on a drawing; a gear wheel rotatively connected with said post in concentric relation thereto; an offset bracket bearing rigidly connected, with said post; a transmission gear wheel rotatively mounted on said bearing and operatively engaging the first-mentioned gear wheel; a manipulating rod operatively eonnectedwith said transmission gear wheel; a marking member slidabl-y mounted on said manipulating rod; a crank arm rigidly connected with said firstm-entioned gear wheel; and a link operatively connecting said marking-member and said crank arm.

3. A compass as characterized comprising a rigid center post; means for disposing the same non-rotatively on a drawing; an offset bearing bracket rigidly mounted on said post; a rotary memberdisposed in concentric relation to said post; a manipulating bar rotatively connected with said bracket eccentric to said post; an adjusting bar rotatively mounted on said bracket conc'e'ntricto said post; means operatively connecting'the pivot mountings of saidnianipulati'ngbar and said adjusting bar for rotating' the same in relatively reverse rotary directions; a marking" member slidably mounted on said manipulating bar; a link movablfvconnected with said adjusting bar and said marking member; and means for fastening said link relative to said adjusting bar and to said marking member.

J OHN H. CHARLES BEISSWENGER.

Copies ofv this. patentmay be: obtained: for-five: centseach, by addressing". the Commissioner. of; Patents,

Washington, 11.0. 

